B0481

Read the instructions below then start the fault diagnostic procedure.

Symptom: Poor heating of cabin Heater is stopped but is permitted to attempt restart

B0481

Fault symptoms

Poor heating of cabin

Heater is stopped but is permitted to attempt restart

Conditions

Heater is activated.

Coolant temperature sensor 1 or 2 registers a temperature exceeding 125°C (257°F) (resistance below 330 ohms).

Diagnostic help

The temperature value from coolant temperature sensor 1 and 2 can be read using the diagnostics tool.

The heater is provided with extra cabling and connector which is isolated from the ordinary cabling from the heater. This cabling and connector is not used but is connected to the control module, therefore always check that this cabling is undamaged before beginning fault tracing.

In the ordinary cabling between the heater and the 8-pin connector, there is an extra light green lead that is cut and is not used.